Seiko Cal. 4420 - 527

The Seiko 4420-527 represents an important milestone in Seiko's 1970 lineup. Powered by the 4420 caliber with 20j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-e2e0e13a4822]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

13.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1970

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